Ipsen SAIpsen acquires Kartos Therapeutics for up to $1.75B, adding late-stage oncology pipeline asset navtemadlin.

Ipsen has agreed to acquire Kartos Therapeutics, a clinical-stage biopharmaceutical company, for $450 million upfront and up to $1.3 billion in milestone payments, bringing the total potential deal value to $1.75 billion. The acquisition centers on navtemadlin, an oral MDM2 inhibitor in a Phase III trial for myelofibrosis, with top-line data expected in 2027. Ipsen CEO David Loew said the deal strengthens the company's late-stage oncology pipeline and that navtemadlin could become a new treatment option as early as 2028. The transaction is expected to close by the end of the third quarter, subject to antitrust clearance, and is projected to add to Ipsen's core operating income starting in 2029.
Ipsen SAIpsen acquires Kartos Therapeutics for up to $1.75B, adding late-stage oncology pipeline asset navtemadlin.
Kartos Therapeutics is acquired by Ipsen for $450M upfront plus up to $1.3B milestones.